javascript - 冲突的@Dragenter @Dragleave/v-show 事件持续快速触发

Question

指针事件:无；已经实现了，在调试中， bool 值在“拖动”和“拖动OL”的true和false之间快速切换

HTML 结构

     <ol id="product-images" @dragenter="draggingOL=true" @dragleave="draggingOL=false">

        <li v-for="(file, key) in files" style="pointer-events: none;"></li>

      </ol>


      <div v-show="files.length < 1 || draggingOL == true">
         <div ref="fileform" :class="['next-upload-dropzone', dragging ? 'css1' : '', draggingOL ? 'css1 css2' : '']" @dragenter="dragging=true" @dragleave="dragging=false">

         </div>
      </div>

基本上当你把一张图片拖进DIV标签后，OL标签就会出现。

OL 标签没有可拖动的，所以我添加了 Dragenter 并留给 OL

当我将第二个 dragenter 添加到 OL 标签时，当您将图像拖入该区域时， dragging 和 draggingOL 的 bool 值将以 0.5s 的间隔快速在 true 和 false 之间切换。 CSS 也一样，非常快速地显示和取消显示。

我尝试了几种方法，包括只有一个 dragenter ONLY，同样的问题。也许问题出在 v-show 上，我不确定。

以上是DIV标签的图片 上图为OL标签图片

Javascript

var dropFileApp = new Vue({
    el: '#dropfile',
    data: {
        dragAndDropCapable: false,
        dragging : false,
        draggingOL : false,
        files: [],
        uploadPercentage: 0
    },
    // define methods under the `methods` object
    mounted(){
  /*
    Determine if drag and drop functionality is capable in the browser
  */
  this.dragAndDropCapable = this.determineDragAndDropCapable();

  /*
    If drag and drop capable, then we continue to bind events to our elements.
  */
  if( this.dragAndDropCapable ){
    /*
      Listen to all of the drag events and bind an event listener to each
      for the fileform.
    */
    ['drag', 'dragstart', 'dragend', 'dragover', 'dragenter', 'dragleave', 'drop'].forEach( function( evt ) {
      /*
        For each event add an event listener that prevents the default action
        (opening the file in the browser) and stop the propagation of the event (so
        no other elements open the file in the browser)
      */
      this.$refs.fileform.addEventListener(evt, function(e){
        e.preventDefault();
        e.stopPropagation();
      }.bind(this), false);
    }.bind(this));

    /*
      Add an event listener for drop to the form
    */

    this.$refs.fileform.addEventListener('drop', function(e){
      /*
        Capture the files from the drop event and add them to our local files
        array.
      */
      for( let i = 0; i < e.dataTransfer.files.length; i++ ){
        this.files.push( e.dataTransfer.files[i] );
        this.getImagePreviews();
      }
      console.log((this.files.length))
      /*
        Instantly upload files
      */
      this.submitFiles();
    }.bind(this));
  }
},

methods: {
  /*
    Determines if the drag and drop functionality is in the
    window
  */
  determineDragAndDropCapable(){
    /*
      Create a test element to see if certain events
      are present that let us do drag and drop.
    */
    var div = document.createElement('div');

    /*
      Check to see if the `draggable` event is in the element
      or the `ondragstart` and `ondrop` events are in the element. If
      they are, then we have what we need for dragging and dropping files.

      We also check to see if the window has `FormData` and `FileReader` objects
      present so we can do our AJAX uploading
    */
    return ( ( 'draggable' in div )
            || ( 'ondragstart' in div && 'ondrop' in div ) )
            && 'FormData' in window
            && 'FileReader' in window;
  },

  /*
    Gets the image preview for the file.
  */
  getImagePreviews(){
    /*
      Iterate over all of the files and generate an image preview for each one.
    */
    for( let i = 0; i < this.files.length; i++ ){
      /*
        Ensure the file is an image file
      */
      if ( /\.(jpe?g|png|gif)$/i.test( this.files[i].name ) ) {
        /*
          Create a new FileReader object
        */
        let reader = new FileReader();

        /*
          Add an event listener for when the file has been loaded
          to update the src on the file preview.
        */
        reader.addEventListener("load", function(){
          this.$refs['preview'+parseInt( i )][0].src = reader.result;
        }.bind(this), false);

        /*
          Read the data for the file in through the reader. When it has
          been loaded, we listen to the event propagated and set the image
          src to what was loaded from the reader.
        */
        reader.readAsDataURL( this.files[i] );
      }else{
        /*
          We do the next tick so the reference is bound and we can access it.
        */
        this.$nextTick(function(){
          this.$refs['preview'+parseInt( i )][0].src = '/images/file.png';
        });
      }
    }
  },

  /*
    Submits the files to the server
  */
  submitFiles(){
    /*
      Initialize the form data
    */
    let formData = new FormData();

    /*
      Iteate over any file sent over appending the files
      to the form data.
    */
    for( var i = 0; i < this.files.length; i++ ){
      let file = this.files[i];

      formData.append('files[' + i + ']', file);
    }

    /*
      Make the request to the POST /file-drag-drop URL
    */
    axios.post( '/file-drag-drop',
      formData,
      {
        headers: {
            'Content-Type': 'multipart/form-data'
        },
        onUploadProgress: function( progressEvent ) {
        //Showing Loading   
        }.bind(this)
      }
    ).then(function(){
      console.log('SUCCESS!!');
    })
    .catch(function(){
      console.log('FAILURE!!');
    });
  },

  /*
    Removes a select file the user has uploaded
  */
  removeFile( key ){
    this.files.splice( key, 1 );
  }
}
})

我会继续测试和调试并更新此线程。

Answer 1

我遇到了类似的问题。已经解决，需要防止Vue事件的事件冒泡: Prevent event bubbling in Vue

<div v-on:dragleave.self="dragLeave($event)">
    ...
</div>